(Or “message digest function”) A one-way function which takes a variable-length message and produces a fixed-length hash. Given the hash it is computationally infeasible to find a message with that hash; in fact one can’t determine any usable information about a message with that hash, not even a single bit. For some one-way hash functions it’s also computationally impossible to determine two messages which produce the same hash.
A one-way hash function can be private or public, just like an encryption function. MD5, SHA and Snefru are examples of public one-way hash functions.
A public one-way hash function can be used to speed up a public-key digital signature system. Rather than sign a long message, which can take a long time, compute the one-way hash of the message, and sign the hash.
sci.crypt FAQ (ftp://src.doc.ic.ac.uk/usenet/usenet-by-group/sci.crypt/).
- One-way mirror
noun 1. a sheet of glass that can be seen through from one side and is a mirror on the other, used especially for observation of criminal suspects by law-enforcement officials or witnesses.
- One way or another
Also, one way or the other. Somehow, in some fashion, as in One way or another I’m sure we’ll meet again, or He wasn’t sure how to go about building a wall, but he was sure he would manage in one way or the other. [ Mid-1500s ]
- One-way street
Related Terms not a one-way street
- One-way ticket
noun 1. a ticket entitling a passenger to travel only to his destination, without returning Also called (chiefly Brit) single ticket